IMA: open all files O_LARGEFILE

If IMA tried to measure a file which was larger than 4G dentry_open would fail
with -EOVERFLOW since IMA wasn't passing O_LARGEFILE.  This patch passes
O_LARGEFILE to all IMA opens to avoid this problem.
Signed-off-by: Eric Paris <eparis@redhat.com>
Acked-by: Mimi Zohar <zohar@us.ibm.com>
Signed-off-by: James Morris <jmorris@namei.org>

security/integrity/ima/ima_main.c

@@ -180,7 +180,8 @@ int ima_path_check(struct path *path, int mask)
 		struct dentry *dentry = dget(path->dentry);
 		struct vfsmount *mnt = mntget(path->mnt);
 
-		file = dentry_open(dentry, mnt, O_RDONLY, current_cred());
+		file = dentry_open(dentry, mnt, O_RDONLY | O_LARGEFILE,
+				   current_cred());
 		if (IS_ERR(file)) {
 			pr_info("%s dentry_open failed\n", dentry->d_name.name);
 			rc = PTR_ERR(file);